Injection Molding
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PMMA High Injection Pressure Requirement
Problem Phenomenon
Thin-walled parts are underfilled with short shots, and weld lines are clearly visible, affecting appearance
Cause Analysis
PMMA has poor flowability and high viscosity, usually requiring high injection pressure; thin-walled and long-flow-path parts require even more pressure, and slow injection may be needed to ensure flow quality
Solution
①Set higher injection pressure according to the poor flowability characteristic; ②slow injection for optical parts to reduce visible weld lines; ③holding pressure for 2-3 minutes for thick-walled parts; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA's high viscosity determines the high-pressure slow-speed tone; weld line control of optical parts relies on low-speed filling coordinated with gate design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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